Yamaha CS-40m

The CS-40m is a duophonic (2-voice) analog synthesizer that was introduced in 1979.
Although Yamaha had already conquered polyphony with their legendary 8-voice CS-80,
the CS-40m offered a more affordable approach to something other than a mono-synth.
It has a semi-compact 44 note (3 1/2 octave) keyboard, 36 knobs, 12 sliders and
over a dozen buttons for easy hands-on performance and editing. There are also
20 patches of memory which can be off-loaded to cassette tape.

The CS-40m certainly isn't as phatt as the CS-80. In fact, the CS-40m is
more like a 2-voice version of the CS-20m. Like most CS-series synths
the CS-40m has two analog oscillators per voice.
Triangle, sawtooth, and square (pulse) waveforms are available on each
oscillator, plus there is a noise generator. There is also a simple AR (attack/release)
envelope generator for each VCO.

The CS-40m has a multi-mode VCF (filter) switchable between lowpass, bandpass,
and highpass filtering. Basic filter cutoff and resonance controls are here,
but the filter's resonance can't be driven to self-oscillate. It does, however,
have its own ADSR envelope generator for nice sweeping filter effects.
There is a basic LFO (Low Frequency Modulator) for modulating the VCO, VCF or VCA.
All these classic controls and features and sounds... you would expect wood panels...
and there are! The CS-40m has been used by Electronic Dream Plant, Sneaker Pimps, Ultravox, Duran Duran, and Vangelis.

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